[NFC] [PPC] Add PowerPC expected IR tests for C99 complex

Adding this test so that I can extend it in a follow on patch with
expected IR for AIX when I implement complex handling in
AIXABIInfo.

Reviewed By: daltenty, ZarkoCA

Differential Revision: https://reviews.llvm.org/D88105

Author: cebowler

clang/test/CodeGen/powerpc-c99complex.c

@@ -0,0 +1,39 @@
+// RUN: %clang_cc1 -triple powerpc64-unknown-linux -emit-llvm %s -o - | FileCheck %s --check-prefixes=PPC64LNX
+// RUN: %clang_cc1 -triple ppc64le-unknown-linux -emit-llvm %s -o - | FileCheck %s --check-prefixes=PPC64LNX
+// RUN: %clang_cc1 -triple powerpc-unknown-linux -emit-llvm %s -o - | FileCheck %s --check-prefix=PPC32LNX
+
+_Complex float foo1(_Complex float x) {
+  return x;
+// PPC64LNX-LABEL:       define { float, float } @foo1(float %x.{{.*}}, float %x.{{.*}}) #0 {
+// PPC64LNX:             ret { float, float }
+
+// PPC32LNX-LABEL:       define void @foo1({ float, float }* noalias sret align 4 %agg.result, { float, float }* byval({ float, float }) align 4 %x) #0 {
+// PPC32LNX:             [[RETREAL:%.*]] = getelementptr inbounds { float, float }, { float, float }* %agg.result, i32 0, i32 0
+// PPC32LNX-NEXT:        [[RETIMAG:%.*]] = getelementptr inbounds { float, float }, { float, float }* %agg.result, i32 0, i32 1
+// PPC32LNX-NEXT:        store float %{{.*}}, float* [[RETREAL]], align 4
+// PPC32LNX-NEXT:        store float %{{.*}}, float* [[RETIMAG]], align 4
+}
+
+_Complex double foo2(_Complex double x) {
+  return x;
+// PPC64LNX-LABEL:       define { double, double } @foo2(double %x.{{.*}}, double %x.{{.*}}) #0 {
+// PPC64LNX:             ret { double, double }
+
+// PPC32LNX-LABEL:       define void @foo2({ double, double }* noalias sret align 8 %agg.result, { double, double }* byval({ double, double }) align 8 %x) #0 {
+// PPC32LNX:             [[RETREAL:%.*]] = getelementptr inbounds { double, double }, { double, double }* %agg.result, i32 0, i32 0
+// PPC32LNX-NEXT:        [[RETIMAG:%.*]] = getelementptr inbounds { double, double }, { double, double }* %agg.result, i32 0, i32 1
+// PPC32LNX-NEXT:        store double %{{.*}}, double* [[RETREAL]], align 8
+// PPC32LNX-NEXT:        store double %{{.*}}, double* [[RETIMAG]], align 8
+}
+
+_Complex long double foo3(_Complex long double x) {
+  return x;
+// PPC64LNX-LABEL:      define { ppc_fp128, ppc_fp128 } @foo3(ppc_fp128 %x.{{.*}}, ppc_fp128 %x.{{.*}}) #0 {
+// PPC64LNX:            ret { ppc_fp128, ppc_fp128 }
+
+// PPC32LNX-LABEL:      define void @foo3({ ppc_fp128, ppc_fp128 }* noalias sret align 16 %agg.result, { ppc_fp128, ppc_fp128 }* byval({ ppc_fp128, ppc_fp128 }) align 16 %x) #0 {
+// PPC32LNX:            [[RETREAL:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, { ppc_fp128, ppc_fp128 }* %agg.result, i32 0, i32 0
+// PPC32LNX-NEXT:       [[RETIMAG:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, { ppc_fp128, ppc_fp128 }* %agg.result, i32 0, i32 1
+// PPC32LNX-NEXT:       store ppc_fp128 %{{.*}}, ppc_fp128* [[RETREAL]], align 16
+// PPC32LNX-NEXT:       store ppc_fp128 %{{.*}}, ppc_fp128* [[RETIMAG]], align 16
+}