Make the following changes in MipsAsmPrinter.cpp:

- Remove code which lowers pseudo SETGP01.
- Fix LowerSETGP01. The first two of the three instructions that are emitted to
  initialize the global pointer register now use register $2.
- Stop emitting .cpload directive.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156689 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/Mips/zeroreg.ll

@@ -4,8 +4,7 @@
 
 define i32 @foo0(i32 %s) nounwind readonly {
 entry:
-; CHECK-NOT: addiu
-; CHECK:     movn
+; CHECK:     movn ${{[0-9]+}}, $zero
   %tobool = icmp ne i32 %s, 0
   %0 = load i32* @g1, align 4, !tbaa !0
   %cond = select i1 %tobool, i32 0, i32 %0
@@ -14,8 +13,7 @@ entry:
 
 define i32 @foo1(i32 %s) nounwind readonly {
 entry:
-; CHECK-NOT: addiu
-; CHECK:     movz
+; CHECK:     movz ${{[0-9]+}}, $zero
   %tobool = icmp ne i32 %s, 0
   %0 = load i32* @g1, align 4, !tbaa !0
   %cond = select i1 %tobool, i32 %0, i32 0