[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/BPF/ex1.ll b/llvm/test/CodeGen/BPF/ex1.ll
index 9dd26ea3..0145851 100644
--- a/llvm/test/CodeGen/BPF/ex1.ll
+++ b/llvm/test/CodeGen/BPF/ex1.ll
@@ -14,7 +14,7 @@
   %1 = getelementptr inbounds [3 x i8], [3 x i8]* %devname, i64 0, i64 0
   call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* getelementptr inbounds ([3 x i8]* @bpf_prog1.devname, i64 0, i64 0), i64 3, i32 1, i1 false)
   %2 = getelementptr inbounds %struct.bpf_context, %struct.bpf_context* %ctx, i64 0, i32 0
-  %3 = load i64* %2, align 8
+  %3 = load i64, i64* %2, align 8
   %4 = inttoptr i64 %3 to %struct.sk_buff*
   %5 = getelementptr inbounds %struct.sk_buff, %struct.sk_buff* %4, i64 0, i32 2
   %6 = bitcast i64* %5 to i8*