[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/global-address.ll b/llvm/test/CodeGen/Mips/global-address.ll
index ae6afeb..ecf5e56 100644
--- a/llvm/test/CodeGen/Mips/global-address.ll
+++ b/llvm/test/CodeGen/Mips/global-address.ll
@@ -33,9 +33,9 @@
 ; STATIC-N64: lw  ${{[0-9]+}}, %got_ofst(s1)($[[R1]])
 ; STATIC-N64: ld  ${{[0-9]+}}, %got_disp(g1)
 
-  %0 = load i32* @s1, align 4
+  %0 = load i32, i32* @s1, align 4
   tail call void @foo1(i32 %0) nounwind
-  %1 = load i32* @g1, align 4
+  %1 = load i32, i32* @g1, align 4
   store i32 %1, i32* @s1, align 4
   %add = add nsw i32 %1, 2
   store i32 %add, i32* @g1, align 4