[clang] [llvm] [PowerPC] Fix codegen for transparent_union function params (PR #101738)

[Hubert Tong via cfe-commits]

================
@@ -0,0 +1,67 @@
+// RUN: %clang_cc1 -triple powerpc64le-unknown-linux -O2 -target-cpu pwr7 \
+// RUN:   -emit-llvm -fshort-enums %s -o - | FileCheck %s 
--check-prefixes=CHECK,CHECK-64
+// RUN: %clang_cc1 -triple powerpc64-unknown-linux -O2 -target-cpu pwr7 \
+// RUN:   -emit-llvm -fshort-enums %s -o - | FileCheck %s 
--check-prefixes=CHECK,CHECK-64
+// RUN: %clang_cc1 -triple powerpc-unknown-linux -O2 -target-cpu pwr7 \
+// RUN:   -emit-llvm -fshort-enums %s -o - | FileCheck %s 
--check-prefixes=CHECK,CHECK-32
+// RUN: %clang_cc1 -triple powerpc64-unknown-aix -O2 -target-cpu pwr7 \
+// RUN:   -emit-llvm -fshort-enums %s -o - | FileCheck %s 
--check-prefixes=CHECK,CHECK-64
+// RUN: %clang_cc1 -triple powerpc-unknown-aix -O2 -target-cpu pwr7 \
+// RUN:   -emit-llvm -fshort-enums %s -o - | FileCheck %s 
--check-prefixes=CHECK,CHECK-32
+
+typedef union tu_c {
+       char a;
+       char b;
----------------
hubert-reinterpretcast wrote:

Don't use plain `char` its (default) signedness is meant to be 
platform-dependent.
```suggestion
        signed char a;
        signed char b;
```

https://github.com/llvm/llvm-project/pull/101738
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