expose __clzdi2 and __clzti2 for linkage

Author: Jan Philipp Hafer

lib/std/special/compiler_rt.zig

@@ -276,6 +276,10 @@ comptime {
 
     const __clzsi2 = @import("compiler_rt/clzsi2.zig").__clzsi2;
     @export(__clzsi2, .{ .name = "__clzsi2", .linkage = linkage });
+    const __clzdi2 = @import("compiler_rt/clzdi2.zig").__clzdi2;
+    @export(__clzdi2, .{ .name = "__clzdi2", .linkage = linkage });
+    const __clzti2 = @import("compiler_rt/clzti2.zig").__clzti2;
+    @export(__clzti2, .{ .name = "__clzti2", .linkage = linkage });
 
     if (builtin.link_libc and os_tag == .openbsd) {
         const __emutls_get_address = @import("compiler_rt/emutls.zig").__emutls_get_address;

lib/std/special/compiler_rt/clzsi2_test.zig

@@ -273,6 +273,7 @@ test "clzsi2" {
     try test__clzsi2(0xFD000000, 0);
     try test__clzsi2(0xFE000000, 0);
     try test__clzsi2(0xFF000000, 0);
+    try test__clzsi2(0x00000000, 32);
     try test__clzsi2(0x00000001, 31);
     try test__clzsi2(0x00000002, 30);
     try test__clzsi2(0x00000004, 29);