cranelift codegen: pass source locations with external relocations;

cranelift/filetests/src/test_binemit.rs

@@ -79,6 +79,7 @@ impl binemit::CodeSink for TextSink {
 
     fn reloc_external(
         &mut self,
+        _srcloc: ir::SourceLoc,
         reloc: binemit::Reloc,
         name: &ir::ExternalName,
         addend: binemit::Addend,

cranelift/filetests/src/test_compile.rs

@@ -101,6 +101,7 @@ impl binemit::CodeSink for SizeSink {
     fn reloc_block(&mut self, _reloc: binemit::Reloc, _block_offset: binemit::CodeOffset) {}
     fn reloc_external(
         &mut self,
+        _srcloc: ir::SourceLoc,
         _reloc: binemit::Reloc,
         _name: &ir::ExternalName,
         _addend: binemit::Addend,

cranelift/filetests/src/test_rodata.rs

@@ -109,7 +109,14 @@ impl binemit::CodeSink for RodataSink {
     }
 
     fn reloc_block(&mut self, _reloc: binemit::Reloc, _block_offset: binemit::CodeOffset) {}
-    fn reloc_external(&mut self, _: binemit::Reloc, _: &ir::ExternalName, _: binemit::Addend) {}
+    fn reloc_external(
+        &mut self,
+        _: ir::SourceLoc,
+        _: binemit::Reloc,
+        _: &ir::ExternalName,
+        _: binemit::Addend,
+    ) {
+    }
     fn reloc_constant(&mut self, _: binemit::Reloc, _: ir::ConstantOffset) {}
     fn reloc_jt(&mut self, _reloc: binemit::Reloc, _jt: ir::JumpTable) {}
     fn trap(&mut self, _code: ir::TrapCode, _srcloc: ir::SourceLoc) {}