[Backport to 19] Fix incorrect translation for AtomicCmpExchangeWeak builtin ptr arg type. (#3390) (#3394)

Add missing case so that pointer argument types for
`OpAtomicCompareExchangeWeak` are resolved correctly. The newly added
test, without this patch would introduce an invalid bitcast just before
the atomic builtin.

Author: maarquitos14

lib/SPIRV/SPIRVTypeScavenger.cpp

@@ -453,6 +453,7 @@ bool SPIRVTypeScavenger::typeIntrinsicCall(
     case OpAtomicLoad:
     case OpAtomicExchange:
     case OpAtomicCompareExchange:
+    case OpAtomicCompareExchangeWeak:
     case OpAtomicIAdd:
     case OpAtomicISub:
     case OpAtomicFAddEXT:

test/AtomicCompareExchangeExplicit.ll

@@ -0,0 +1,40 @@
+; RUN: llvm-as %s -o %t.bc
+; RUN: llvm-spirv %t.bc -spirv-text -o - | FileCheck %s --check-prefixes=CHECK
+; RUN: llvm-spirv %t.bc -o %t.spv
+; RUN: spirv-val %t.spv
+
+target datalayout = "e-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024"
+target triple = "spir64"
+
+; CHECK-DAG: 4 TypeInt [[#int:]] 32 0
+; CHECK-DAG: Constant [[#int]] [[#DeviceScope:]] 4
+; CHECK-DAG: Constant [[#int]] [[#SequentiallyConsistent_MS:]] 0
+; CHECK-DAG: 4 TypePointer [[#int_ptr:]] 4 [[#int]]
+; CHECK-DAG: 2 TypeBool [[#bool:]]
+
+define spir_kernel void @test_atomic_kernel() {
+entry:
+  %arrayidx7 = getelementptr i32, ptr addrspace(3) null, i64 0
+
+; CHECK: PtrAccessChain [[#int_ptr]] [[#Pointer:]] [[#]] [[#]] 
+; CHECK: Load [[#int]] [[#Comparator:]] [[#]]
+; CHECK-NEXT: AtomicCompareExchange [[#int]] [[#Result:]] [[#Pointer]] [[#DeviceScope]] [[#SequentiallyConsistent_MS]] [[#SequentiallyConsistent_MS]] [[#]] [[#Comparator]]
+; CHECK-NEXT: Store [[#]] [[#Result]]
+; CHECK-NEXT: IEqual [[#bool]] [[#]] [[#Result]] [[#Comparator]]
+  %call10 = call spir_func i1 @_Z37atomic_compare_exchange_weak_explicitPU3AS3VU7_AtomiciPii12memory_orderS4_12memory_scope(ptr addrspace(3) %arrayidx7, ptr null, i32 14, i32 0, i32 0, i32 0)
+
+; CHECK: Load [[#int]] [[#Comparator:]] [[#]]
+; CHECK-NEXT: AtomicCompareExchange [[#int]] [[#Result2:]] [[#Pointer]] [[#DeviceScope]] [[#SequentiallyConsistent_MS]] [[#SequentiallyConsistent_MS]] [[#]] [[#Comparator]]
+; CHECK-NEXT: Store [[#]] [[#Result2]]
+; CHECK-NEXT: IEqual [[#bool]] [[#]] [[#Result2]] [[#Comparator]]
+  %call11 = call spir_func i1 @_Z39atomic_compare_exchange_strong_explicitPU3AS3VU7_AtomiciPii12memory_orderS4_12memory_scope(ptr addrspace(3) %arrayidx7, ptr null, i32 14, i32 0, i32 0, i32 0)
+  ret void
+}
+
+declare spir_func i1 @_Z37atomic_compare_exchange_weak_explicitPU3AS3VU7_AtomiciPii12memory_orderS4_12memory_scope(ptr addrspace(3), ptr, i32, i32, i32, i32)
+declare spir_func i1 @_Z39atomic_compare_exchange_strong_explicitPU3AS3VU7_AtomiciPii12memory_orderS4_12memory_scope(ptr addrspace(3), ptr, i32, i32, i32, i32)
+
+!opencl.ocl.version = !{!0}
+
+!0 = !{i32 3, i32 0}
+