Remove support for the -no-checking flag (#392)

* Remove support for the -no-checking flag

Fixes #381
Fixes #383
Work on #382

- No longer expose flag through API (`SLANG_COMPILE_FLAG_NO_CHECKING`) and command-line (`-no-checking`) options

- Remove all logic in `check.cpp` that was withholding diagnostics (including errors) when the no-checking mode was enabled

- Remove `HiddenImplicitCastExpr`, which was only created to support no-checking mode (it represented an implicit cast that our checking through was needed, but couldn't emit because it might be wrong)

- Remove logic for storing function bodies as raw token lists when checking is turned off. I'm leaving in the `UnparsedStmt` AST node in case we ever need/want to lazily parse and check function bodies down the line.

- Remove a few of the code-generation paths we had to contend with, but keep the comment about them in place.

- Remove GLSL-based tests that can't meaningfully work with the new approach.

- Fix other tests that used a GLSL baseline so that their GLSL compiles with `-pass-through glslang` instead of invoking `slang` with the `-no-checking` flag.

- Remove tests that were explicitly added to test the "rewriter + IR" path, since that is no longer supported.

There is more cleanup that can be done here, now that we know that AST-based rewrite and IR will never co-exist, but it is probably easier to deal with that as part of removing the AST-based rewrite path.

We've lost some test coverage here, but actually not too much if we consider that we are dropping GLSL input anyway.

* Fixup: test runner was mis-counting ignored tests

* Fixup: turn on dumping on test failure under Travis

* Fixup: enable extensions in Linux build of glslang

3 files changed, 0 insertions, 88 deletions

diff --git a/tests/glsl/sascha-willems/viewportarray/multiview.geom b/tests/glsl/sascha-willems/viewportarray/multiview.geom
deleted file mode 100644
index 39303fb33..000000000
--- a/tests/glsl/sascha-willems/viewportarray/multiview.geom
+++ /dev/null
@@ -1,46 +0,0 @@
-//TEST:COMPARE_GLSL:
-#version 450
-
-#extension GL_ARB_viewport_array : enable
-
-layout (triangles, invocations = 2) in;
-layout (triangle_strip, max_vertices = 3) out;
-
-layout (binding = 0) uniform UBO 
-{
-	mat4 projection[2];
-	mat4 modelview[2];
-	vec4 lightPos;
-} ubo;
-
-layout (location = 0) in vec3 inNormal[];
-layout (location = 1) in vec3 inColor[];
-
-layout (location = 0) out vec3 outNormal;
-layout (location = 1) out vec3 outColor;
-layout (location = 2) out vec3 outViewVec;
-layout (location = 3) out vec3 outLightVec;
-
-void main(void)
-{	
-	for(int i = 0; i < gl_in.length(); i++)
-	{
-		outNormal = mat3(ubo.modelview[gl_InvocationID]) * inNormal[i];
-		outColor = inColor[i];
-
-		vec4 pos = gl_in[i].gl_Position;
-		vec4 worldPos = (ubo.modelview[gl_InvocationID] * pos);
-		
-		vec3 lPos = vec3(ubo.modelview[gl_InvocationID]  * ubo.lightPos);
-		outLightVec = lPos - worldPos.xyz;
-		outViewVec = -worldPos.xyz;	
-	
-		gl_Position = ubo.projection[gl_InvocationID] * worldPos;
-
-		// Set the viewport index that the vertex will be emitted to
-		gl_ViewportIndex = gl_InvocationID;
-
-		EmitVertex();
-	}
-	EndPrimitive();
-}
\ No newline at end of file
diff --git a/tests/glsl/sascha-willems/viewportarray/scene.frag b/tests/glsl/sascha-willems/viewportarray/scene.frag
deleted file mode 100644
index 1ecd7fdb3..000000000
--- a/tests/glsl/sascha-willems/viewportarray/scene.frag
+++ /dev/null
@@ -1,21 +0,0 @@
-//TEST:COMPARE_GLSL:
-#version 450
-
-layout (location = 0) in vec3 inNormal;
-layout (location = 1) in vec3 inColor;
-layout (location = 2) in vec3 inViewVec;
-layout (location = 3) in vec3 inLightVec;
-
-layout (location = 0) out vec4 outColor;
-
-void main() 
-{
-	vec3 N = normalize(inNormal);
-	vec3 L = normalize(inLightVec);
-	vec3 V = normalize(inViewVec);
-	vec3 R = reflect(-L, N);
-	vec3 ambient = vec3(0.1);
-	vec3 diffuse = max(dot(N, L), 0.0) * vec3(1.0);
-	vec3 specular = pow(max(dot(R, V), 0.0), 16.0) * vec3(0.75);
-	outColor = vec4((ambient + diffuse) * inColor.rgb + specular, 1.0);		
-}
\ No newline at end of file
diff --git a/tests/glsl/sascha-willems/viewportarray/scene.vert b/tests/glsl/sascha-willems/viewportarray/scene.vert
deleted file mode 100644
index 28e1c3d8b..000000000
--- a/tests/glsl/sascha-willems/viewportarray/scene.vert
+++ /dev/null
@@ -1,21 +0,0 @@
-//TEST:COMPARE_GLSL:
-#version 450
-
-layout (location = 0) in vec3 inPos;
-layout (location = 1) in vec3 inNormal;
-layout (location = 2) in vec3 inColor;
-
-layout (location = 0) out vec3 outNormal;
-layout (location = 1) out vec3 outColor;
-
-out gl_PerVertex
-{
-	vec4 gl_Position;
-};
-
-void main() 
-{
-	outColor = inColor;
-	outNormal = inNormal;
-	gl_Position = vec4(inPos.xyz, 1.0);	
-}