tests: support -Zsymbol-mangling-version=v0 being the default.

src/test/debuginfo/function-call.rs

@@ -1,5 +1,5 @@
 // This test does not passed with gdb < 8.0. See #53497.
-// min-gdb-version: 8.0
+// min-gdb-version: 10.1
 
 // compile-flags:-g
 

src/test/debuginfo/function-names.rs

@@ -1,5 +1,5 @@
 // Function names are formatted differently in old versions of GDB
-// min-gdb-version: 9.2
+// min-gdb-version: 10.1
 
 // compile-flags:-g
 

src/test/ui/panics/issue-47429-short-backtraces.legacy.run.stderr

@@ -1,4 +1,4 @@
-thread 'main' panicked at 'explicit panic', $DIR/issue-47429-short-backtraces.rs:16:5
+thread 'main' panicked at 'explicit panic', $DIR/issue-47429-short-backtraces.rs:21:5
 stack backtrace:
    0: std::panicking::begin_panic
    1: issue_47429_short_backtraces::main

src/test/ui/panics/issue-47429-short-backtraces.rs

@@ -12,6 +12,11 @@
 // ignore-emscripten no panic or subprocess support
 // ignore-sgx no subprocess support
 
+// NOTE(eddyb) output differs between symbol mangling schemes
+// revisions: legacy v0
+// [legacy] compile-flags: -Zsymbol-mangling-version=legacy
+//     [v0] compile-flags: -Zsymbol-mangling-version=v0
+
 fn main() {
     panic!()
 }

src/test/ui/panics/issue-47429-short-backtraces.v0.run.stderr

@@ -0,0 +1,5 @@
+thread 'main' panicked at 'explicit panic', $DIR/issue-47429-short-backtraces.rs:21:5
+stack backtrace:
+   0: std::panicking::begin_panic::<&str>
+   1: issue_47429_short_backtraces::main
+note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.