Rollup merge of rust-lang#52952 - cramertj:llvm-update, r=alexcrichton

cramertj · web-flow · commit 4889e0fe0c03 · 2018-08-02T11:26:01.000-07:00
Update LLVM submodule Fix rust-lang#52884 r? @alexcrichton
diff --git a/src/llvm b/src/llvm
@@ -1 +1 @@
-Subproject commit 03684905101f0b7e49dfe530e54dc1aeac6ef0fb
+Subproject commit f4130c026163c984bc1b8ef6d75903a62268a698
