Revert "[PowerPC] Fix EmitPPCBuiltinExpr to emit arguments once"

clang/lib/CodeGen/CGBuiltin.cpp

clang/test/CodeGen/PowerPC/builtins-ppc-fastmath.c

clang/test/CodeGen/PowerPC/builtins-ppc-pair-mma-types.c

clang/test/CodeGen/PowerPC/builtins-ppc-stmtexpr-argument.c

clang/test/CodeGen/PowerPC/builtins-ppc-vsx.c

clang/test/CodeGen/PowerPC/builtins-ppc-xlcompat-cas.c

clang/test/CodeGen/PowerPC/builtins-ppc-xlcompat-fetch.c

clang/test/CodeGen/PowerPC/builtins-ppc-xlcompat-fp.c

clang/test/CodeGen/PowerPC/builtins-ppc-xlcompat-math.c

clang/test/CodeGen/PowerPC/builtins-ppc-xlcompat-sync.c

clang/test/CodeGen/PowerPC/ppc-mma-types.c

clang/test/Sema/ppc-pair-mma-types.c