Rollup merge of rust-lang#137530 - LukasWoodtli:gardena/lw/mips_dwarf…

…, r=jieyouxu

DWARF mixed versions with LTO on MIPS

On MIPS the DWARF version is stored in 2 bytes with the `.2byte` assembler directive.

tests/assembly/dwarf-mixed-versions-lto.rs

@@ -1,5 +1,6 @@
 // This test ensures that if LTO occurs between crates with different DWARF versions, we
 // will choose the highest DWARF version for the final binary. This matches Clang's behavior.
+// Note: `.2byte` directive is used on MIPS.
 
 //@ only-linux
 //@ aux-build:dwarf-mixed-versions-lto-aux.rs
@@ -14,6 +15,6 @@ fn main() {
 }
 
 // CHECK: .section .debug_info
-// CHECK-NOT: {{\.(short|hword)}} 2
-// CHECK-NOT: {{\.(short|hword)}} 4
-// CHECK: {{\.(short|hword)}} 5
+// CHECK-NOT: {{\.(short|hword|2byte)}} 2
+// CHECK-NOT: {{\.(short|hword|2byte)}} 4
+// CHECK: {{\.(short|hword|2byte)}} 5