[llvm] [SPIR-V] Fix types of internal intrinsic functions and add a test case for __builtin_alloca() (PR #92265)

[Michal Paszkowski via llvm-commits]

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@@ -27,7 +27,7 @@ let TargetPrefix = "spv" in {
   def int_spv_insertv : Intrinsic<[llvm_i32_ty], [llvm_i32_ty, llvm_any_ty, llvm_vararg_ty]>;
   def int_spv_extractelt : Intrinsic<[llvm_any_ty], [llvm_any_ty, llvm_anyint_ty]>;
   def int_spv_insertelt : Intrinsic<[llvm_any_ty], [llvm_any_ty, llvm_any_ty, llvm_anyint_ty]>;
-  def int_spv_const_composite : Intrinsic<[llvm_i32_ty], [llvm_vararg_ty]>;
+  def int_spv_const_composite : Intrinsic<[llvm_any_ty], [llvm_vararg_ty]>;
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michalpaszkowski wrote:

Please also change the description in [SPIRVUsage](https://llvm.org/docs/SPIRVUsage.html#target-intrinsics) file. It might make sense to add a comment somewhere in IntrinsicsSPIRV.td which will signal that any modifications/new intrinsics need to be also documented in SPIRVUsage.

https://github.com/llvm/llvm-project/pull/92265