[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/Analysis/BasicAA/memset_pattern.ll b/llvm/test/Analysis/BasicAA/memset_pattern.ll
index 590664c..25bdb2e 100644
--- a/llvm/test/Analysis/BasicAA/memset_pattern.ll
+++ b/llvm/test/Analysis/BasicAA/memset_pattern.ll
@@ -13,7 +13,7 @@
   store i32 1, i32* @z
   tail call void @memset_pattern16(i8* bitcast (i32* @y to i8*), i8* bitcast (i32* @x to i8*), i64 4) nounwind
 ; CHECK-NOT: load
-  %l = load i32* @z
+  %l = load i32, i32* @z
 ; CHECK: ret i32 1
   ret i32 %l
 }