[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/X86/aligned-variadic.ll b/llvm/test/CodeGen/X86/aligned-variadic.ll
index 60d0f71..2941592 100644
--- a/llvm/test/CodeGen/X86/aligned-variadic.ll
+++ b/llvm/test/CodeGen/X86/aligned-variadic.ll
@@ -12,7 +12,7 @@
   %arraydecay1 = bitcast [1 x %struct.__va_list_tag]* %va to i8*
   call void @llvm.va_start(i8* %arraydecay1)
   %overflow_arg_area_p = getelementptr inbounds [1 x %struct.__va_list_tag], [1 x %struct.__va_list_tag]* %va, i64 0, i64 0, i32 2
-  %overflow_arg_area = load i8** %overflow_arg_area_p, align 8
+  %overflow_arg_area = load i8*, i8** %overflow_arg_area_p, align 8
   %overflow_arg_area.next = getelementptr i8, i8* %overflow_arg_area, i64 24
   store i8* %overflow_arg_area.next, i8** %overflow_arg_area_p, align 8
 ; X32: leal    68(%esp), [[REG:%.*]]