[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/DebugInfo/X86/lexical_block.ll b/llvm/test/DebugInfo/X86/lexical_block.ll
index a9e377a..06d217a 100644
--- a/llvm/test/DebugInfo/X86/lexical_block.ll
+++ b/llvm/test/DebugInfo/X86/lexical_block.ll
@@ -27,7 +27,7 @@
   %i = alloca i32, align 4
   call void @llvm.dbg.declare(metadata i32* %i, metadata !11, metadata !{!"0x102"}), !dbg !14
   store i32 3, i32* %i, align 4, !dbg !14
-  %0 = load i32* %i, align 4, !dbg !14
+  %0 = load i32, i32* %i, align 4, !dbg !14
   %tobool = icmp ne i32 %0, 0, !dbg !14
   br i1 %tobool, label %if.then, label %if.end, !dbg !14