Use the integrated assembler as default on PowerPC

This was already done in clang, this commit now uses the integrated
assembler as default when using LLVM tools directly.

A number of test cases using inline asm had to be adapted, either by
updating the expected output, or by using -no-integrated-as (for such
tests that deliberately use an invalid instruction in inline asm).

llvm-svn: 225819
diff --git a/llvm/test/CodeGen/PowerPC/mult-alt-generic-powerpc.ll b/llvm/test/CodeGen/PowerPC/mult-alt-generic-powerpc.ll
index 659cdf7..743cc62 100644
--- a/llvm/test/CodeGen/PowerPC/mult-alt-generic-powerpc.ll
+++ b/llvm/test/CodeGen/PowerPC/mult-alt-generic-powerpc.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=ppc32
+; RUN: llc < %s -march=ppc32 -no-integrated-as
 ; ModuleID = 'mult-alt-generic.c'
 target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32"
 target triple = "powerpc"