Emit 1-based column numbers in debuginfo

The debuginfo column numbers are 1-based. The value 0 indicates that no
column has been specified. Translate 0-based column numbers to 1-based
when emitting debug information.

Author: tmiasko

src/librustc_codegen_llvm/debuginfo/create_scope_map.rs

@@ -79,7 +79,8 @@ fn make_mir_scope(
             parent_scope.scope_metadata.unwrap(),
             file_metadata,
             loc.line as c_uint,
-            loc.col.to_usize() as c_uint,
+            // Loc column is 0-based while debug one is 1-based.
+            loc.col.to_usize() as c_uint + 1,
         ))
     };
     debug_context.scopes[scope] = DebugScope {

src/librustc_codegen_llvm/debuginfo/source_loc.rs

@@ -19,7 +19,8 @@ impl CodegenCx<'ll, '_> {
         let col_used = if self.sess().target.target.options.is_like_msvc {
             UNKNOWN_COLUMN_NUMBER
         } else {
-            loc.col.to_usize() as c_uint
+            // Loc column is 0-based while debug one is 1-based.
+            loc.col.to_usize() as c_uint + 1
         };
 
         unsafe {

src/test/codegen/debug-column.rs

@@ -0,0 +1,16 @@
+// Verify that emitted debuginfo column nubmers are 1-based. Regression test for issue #65437.
+//
+// ignore-windows
+// compile-flags: -C debuginfo=2
+
+fn main() {
+    unsafe {
+        // CHECK: call void @giraffe(), !dbg [[DBG:!.*]]
+        // CHECK: [[DBG]] = !DILocation(line: 10, column: 9
+        giraffe();
+    }
+}
+
+extern {
+    fn giraffe();
+}