Rollup merge of rust-lang#78276 - cutsoy:bump-backtrace, r=nagisa

JohnTitor · web-flow · commit 78799cca2a98 · 2020-10-25T18:43:44.000+09:00
Bump backtrace-rs to enable Mach-O support on iOS. Related to rust-lang/backtrace-rs#378. Fixes backtraces on iOS that were missing in Rust v1.47.0 after switching to gimli because it only enabled Mach-O support on macOS.
diff --git a/backtrace b/backtrace
@@ -1 +1 @@
-Subproject commit a6dd47bd588c882e735675a1379d2b61719fa380
+Subproject commit 8b8ea53b56f519dd7780defdd4254daaec892584

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-Subproject commit a6dd47bd588c882e735675a1379d2b61719fa380`
	`1`	`+Subproject commit 8b8ea53b56f519dd7780defdd4254daaec892584`