Fix mips' long branch pass.

Instructions emitted to compute branch offsets now use immediate operands
instead of symbolic labels. This change was needed because there were problems
when R_MIPS_HI16/LO16 relocations were used to make shared objects.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162731 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/Mips/longbranch.ll

@@ -6,9 +6,15 @@
 define void @foo1(i32 %s) nounwind {
 entry:
 ; O32: bal
+; O32: lui $at, 0
+; O32: addiu $at, $at, {{[0-9]+}} 
+; N64: lui $at, 0
+; N64: daddiu $at, $at, 0
+; N64: dsll $at, $at, 16
+; N64: daddiu $at, $at, 0
 ; N64: bal
-; N64: highest
-; N64: higher
+; N64: dsll $at, $at, 16
+; N64: daddiu $at, $at, {{[0-9]+}}  
 
   %tobool = icmp eq i32 %s, 0
   br i1 %tobool, label %if.end, label %if.then