[clang] [AMDGPU] Add builtin to test for constant memory (PR #209679)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h,cl -- clang/test/CodeGenOpenCL/amdgpu-is-constant.cl clang/include/clang/AST/ASTContext.h clang/include/clang/Basic/TargetInfo.h clang/include/clang/Sema/SemaAMDGPU.h clang/lib/AST/ASTContext.cpp clang/lib/Basic/Targets/AMDGPU.h clang/lib/CodeGen/TargetBuiltins/AMDGPU.cpp clang/lib/CodeGen/Targets/AMDGPU.cpp clang/lib/Sema/SemaAMDGPU.cpp clang/lib/Sema/SemaDecl.cpp clang/lib/Sema/SemaTemplateInstantiateDecl.cpp clang/test/CodeGen/amdgpu-address-spaces.cpp --diff_from_common_commit
``````````

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changing `origin/main` to the base branch/commit you want to compare against.
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<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/TargetBuiltins/AMDGPU.cpp b/clang/lib/CodeGen/TargetBuiltins/AMDGPU.cpp
index d9a93d426..2bb06feac 100644
--- a/clang/lib/CodeGen/TargetBuiltins/AMDGPU.cpp
+++ b/clang/lib/CodeGen/TargetBuiltins/AMDGPU.cpp
@@ -123,8 +123,8 @@ static Value *emitPointerInNamedSection(CodeGenFunction &CGF, Value *Ptr,
 
   std::string StartName = getSectionRangeStartSymbol(Section);
   std::string StopName = getSectionRangeStopSymbol(Section);
-  auto *Start = getSectionRangeBoundary(CGF.CGM, StartName,
-                                        SectionAddressSpace, Loc, DiagPrefix);
+  auto *Start = getSectionRangeBoundary(CGF.CGM, StartName, SectionAddressSpace,
+                                        Loc, DiagPrefix);
   auto *Stop = getSectionRangeBoundary(CGF.CGM, StopName, SectionAddressSpace,
                                        Loc, DiagPrefix);
   if (!Start || !Stop)

``````````

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https://github.com/llvm/llvm-project/pull/209679