[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/GlobalsModRef/modreftest.ll b/llvm/test/Analysis/GlobalsModRef/modreftest.ll
index 3eed916..74101e2 100644
--- a/llvm/test/Analysis/GlobalsModRef/modreftest.ll
+++ b/llvm/test/Analysis/GlobalsModRef/modreftest.ll
@@ -9,7 +9,7 @@
 ; CHECK-NEXT: ret i32 12
 	store i32 12, i32* @X
 	call void @doesnotmodX( )
-	%V = load i32* @X		; <i32> [#uses=1]
+	%V = load i32, i32* @X		; <i32> [#uses=1]
 	ret i32 %V
 }