[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

Essentially the same as the GEP change in r230786.

A similar migration script can be used to update test cases, though a few more
test case improvements/changes were required this time around: (r229269-r229278)

import fileinput
import sys
import re

pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)")

for line in sys.stdin:
  sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line))

Reviewers: rafael, dexonsmith, grosser

Differential Revision: http://reviews.llvm.org/D7649

llvm-svn: 230794
diff --git a/llvm/test/CodeGen/Mips/fpneeded.ll b/llvm/test/CodeGen/Mips/fpneeded.ll
index fdd8e8f..a89e2a5 100644
--- a/llvm/test/CodeGen/Mips/fpneeded.ll
+++ b/llvm/test/CodeGen/Mips/fpneeded.ll
@@ -76,8 +76,8 @@
 define void @foo1() #0 {
 entry:
   store float 1.000000e+00, float* @zz, align 4
-  %0 = load float* @y, align 4
-  %1 = load float* @x, align 4
+  %0 = load float, float* @y, align 4
+  %1 = load float, float* @x, align 4
   %add = fadd float %0, %1
   store float %add, float* @z, align 4
   ret void
@@ -96,7 +96,7 @@
 
 define void @foo2() #0 {
 entry:
-  %0 = load float* @x, align 4
+  %0 = load float, float* @x, align 4
   call void @vf(float %0)
   ret void
 }