[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/Integer/2007-01-19-TruncSext.ll b/llvm/test/Integer/2007-01-19-TruncSext.ll
index 5ec8a57..a487eb2 100644
--- a/llvm/test/Integer/2007-01-19-TruncSext.ll
+++ b/llvm/test/Integer/2007-01-19-TruncSext.ll
@@ -21,7 +21,7 @@
   %i = bitcast i32 0 to i32
   call void @multiply(i32 %i, i32 -1, i32 255) 
   %P = getelementptr [20 x i17], [20 x i17]* @ARRAY, i32 0, i32 0
-  %X = load i17* %P
+  %X = load i17, i17* %P
   %result = sext i17 %X to i32
   %fmt = getelementptr [4 x i8], [4 x i8]* @FORMAT, i32 0, i32 0
   call i32 (i8*,...)* @printf(i8* %fmt, i32 %result)