[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/gprestore.ll b/llvm/test/CodeGen/Mips/gprestore.ll
index cbcf0c9..0b005ab 100644
--- a/llvm/test/CodeGen/Mips/gprestore.ll
+++ b/llvm/test/CodeGen/Mips/gprestore.ll
@@ -18,10 +18,10 @@
 ; CHECK-NOT: got({{.*}})($gp)
 ; CHECK: lw $gp
   tail call void (...)* @f1() nounwind
-  %tmp = load i32* @p, align 4
+  %tmp = load i32, i32* @p, align 4
   tail call void @f2(i32 %tmp) nounwind
-  %tmp1 = load i32* @q, align 4
-  %tmp2 = load i32* @r, align 4
+  %tmp1 = load i32, i32* @q, align 4
+  %tmp2 = load i32, i32* @r, align 4
   tail call void @f3(i32 %tmp1, i32 %tmp2) nounwind
   ret void
 }