[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/srl2.ll b/llvm/test/CodeGen/Mips/srl2.ll
index 26ec092..d1329c7 100644
--- a/llvm/test/CodeGen/Mips/srl2.ll
+++ b/llvm/test/CodeGen/Mips/srl2.ll
@@ -7,12 +7,12 @@
 
 define i32 @main() nounwind {
 entry:
-  %0 = load i32* @i, align 4
-  %1 = load i32* @k, align 4
+  %0 = load i32, i32* @i, align 4
+  %1 = load i32, i32* @k, align 4
   %shr = lshr i32 %0, %1
 ; 16:	srlv	${{[0-9]+}}, ${{[0-9]+}}
   store i32 %shr, i32* @j, align 4
-  %2 = load i32* @j, align 4
+  %2 = load i32, i32* @j, align 4
   %call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([5 x i8]* @.str, i32 0, i32 0), i32 %2)
   ret i32 0
 }