Merge pull request #1951 from svaarala/fix-clang-sanitize-warning

Fix a few clang sanitize warnings

RELEASES.rst

@@ -3379,7 +3379,8 @@ Planned
 
 * Fix harmless -Wcast-align warnings on armhf (GH-1793)
 
-* Various compiler warning fixes (GH-1788, GH-1932, GH-1924, GH-1950, etc)
+* Various compiler warning fixes (GH-1788, GH-1932, GH-1924, GH-1950,
+  GH-1951, etc)
 
 * Add automatic workaround for union aliasing issues with FreeBSD + -m32 +
   Clang prior to 5.0; the aliasing issues cause packed duk_tval to work

src-input/duk_bi_string.c

@@ -1512,7 +1512,7 @@ DUK_INTERNAL duk_ret_t duk_bi_string_prototype_startswith_endswith(duk_hthread *
 
 	if (duk_is_undefined(thr, 1)) {
 		if (magic) {
-			p_cmp_start += DUK_HSTRING_GET_BYTELEN(h) - blen_search;
+			p_cmp_start = p_cmp_start + DUK_HSTRING_GET_BYTELEN(h) - blen_search;
 		} else {
 			/* p_cmp_start already OK */
 		}

src-input/duk_js_compiler.c

@@ -4562,7 +4562,7 @@ DUK_LOCAL void duk__expr_led(duk_compiler_ctx *comp_ctx, duk_ivalue *left, duk_i
 						 * one instruction, so use explicit PC computation.
 						 */
 						DUK_DD(DUK_DDPRINT("rhs is side effect free, rewind and avoid unnecessary temp for reg-based <op>="));
-						DUK_BW_ADD_PTR(comp_ctx->thr, &comp_ctx->curr_func.bw_code, (duk_size_t) (pc_temp_load - pc_before_rhs) * sizeof(duk_compiler_instr));
+						DUK_BW_ADD_PTR(comp_ctx->thr, &comp_ctx->curr_func.bw_code, (pc_temp_load - pc_before_rhs) * (duk_int_t) sizeof(duk_compiler_instr));
 						reg_src = reg_varbind;
 					} else {
 						DUK_DD(DUK_DDPRINT("rhs evaluation emitted code, not sure if rhs is side effect free; use temp reg for LHS"));