Error if super-type capabilities are a super-set of sub-type (#7452)

Fixes: #7410

Changes:
1. super-type capabilities must be a super-set of sub-type capabilities
(and support the same shader stages/targets)
* InheritanceDecl visits super-type to inherit it's capabilities;
validate InheritanceDecl capabilities against sub-type
    * visit all container decl's with a default case 
    * clean up functionDeclBase visitor
* Simplify `diagnoseUndeclaredCapability` by moving logic into
capability checking (more correct*)
3. added changed behavior to documentation
4. fixed some incorrect capabilities
5. **we do not** diagnose capability errors on interface
requirement-to-implementation if both lack explicit capability
requirements. This change is to work around a slangpy regression (test
case for the failing situation is in
`tests\language-feature\capability\capability-interface-extension-1.slang`),
Note: maybe for slang-2026 we don't do this?
6. requirement & implementation must support the same shader
stage/target. This was changed because otherwise we can have cases where
`X` inherits from `Y`, but `Y` is only expected to be used in `glsl`
whilst `X` is expected to be used in `hlsl | glsl`
7. removed
`tests/language-feature/capability/capabilitySimplification3.slang`
because it tests nothing special (redundant)

Note: not using rebase due to separate branches depending on this PR

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>

1 files changed, 12 insertions, 18 deletions

diff --git a/tests/language-feature/capability/capabilitySimplification1.slang b/tests/language-feature/capability/capabilitySimplification1.slang
index 440ac1ced..0e6303412 100644
--- a/tests/language-feature/capability/capabilitySimplification1.slang
+++ b/tests/language-feature/capability/capabilitySimplification1.slang
@@ -1,24 +1,13 @@
 //TEST:SIMPLE(filecheck=CHECK): -target glsl -entry computeMain -stage compute -profile sm_5_0
 //TEST:SIMPLE(filecheck=CHECK_IGNORE_CAPS): -target glsl -emit-spirv-directly -entry computeMain -stage compute  -profile sm_5_0 -ignore-capabilities
 
-
 // CHECK_IGNORE_CAPS-NOT: error 36107
 
-// CHECK: error 36107
-// CHECK-SAME: entrypoint 'computeMain' uses features that are not available in 'compute' stage for 'glsl' target.
-// CHECK: capabilitySimplification1.slang(21): note: see using of 'WaveMultiPrefixCountBits'
-// CHECK-NOT: see using of 'WaveMultiPrefixCountBits'
-// CHECK: {{.*}}.meta.slang({{.*}}): note: see definition of 'WaveMultiPrefixCountBits'
-// CHECK: {{.*}}.meta.slang({{.*}}): note: see declaration of 'require'
-
-void nestedSafeCall()
-{
-    AllMemoryBarrier();
-}
-
-void nestedBadCall()
+[numthreads(1, 1, 1)]
+// CHECK: ([[# @LINE+1]]): error 36107: {{.*}}computeMain{{.*}}compute{{.*}}glsl
+void computeMain()
 {
-    WaveMultiPrefixCountBits(true, 0);
+    nestedCall();
 }
 
 void nestedCall()
@@ -27,8 +16,13 @@ void nestedCall()
     nestedBadCall();
 }
 
-[numthreads(1,1,1)]
-void computeMain()
+void nestedSafeCall()
 {
-    nestedCall();
+    AllMemoryBarrier();
 }
+
+void nestedBadCall()
+{
+    // CHECK: ([[# @LINE+1]]): note: see using of 'WaveMultiPrefixCountBits'
+    WaveMultiPrefixCountBits(true, 0);
+}
\ No newline at end of file