[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/2008-03-05-SxtInRegBug.ll b/llvm/test/CodeGen/ARM/2008-03-05-SxtInRegBug.ll
index dabe620..b0a50a4 100644
--- a/llvm/test/CodeGen/ARM/2008-03-05-SxtInRegBug.ll
+++ b/llvm/test/CodeGen/ARM/2008-03-05-SxtInRegBug.ll
@@ -4,7 +4,7 @@
 entry:
 	br label %bb1
 bb1:		; preds = %entry
-	%tmp3.i.i = load i8* null, align 1		; <i8> [#uses=1]
+	%tmp3.i.i = load i8, i8* null, align 1		; <i8> [#uses=1]
 	%tmp4.i.i = icmp slt i8 %tmp3.i.i, 0		; <i1> [#uses=1]
 	br i1 %tmp4.i.i, label %bb2, label %bb3
 bb2:		; preds = %bb1