[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/ARM/negative-offset.ll b/llvm/test/CodeGen/ARM/negative-offset.ll
index a5fdb1e..bafc964 100644
--- a/llvm/test/CodeGen/ARM/negative-offset.ll
+++ b/llvm/test/CodeGen/ARM/negative-offset.ll
@@ -8,9 +8,9 @@
 ;CHECK: ldr r{{.*}}, [r0, #-16]
 ;CHECK: ldr r{{.*}}, [r0, #-8]
   %arrayidx = getelementptr inbounds i32, i32* %p, i32 -4
-  %0 = load i32* %arrayidx, align 4
+  %0 = load i32, i32* %arrayidx, align 4
   %arrayidx1 = getelementptr inbounds i32, i32* %p, i32 -2
-  %1 = load i32* %arrayidx1, align 4
+  %1 = load i32, i32* %arrayidx1, align 4
   %add = add nsw i32 %1, %0
   ret i32 %add
 }