Fix Issue 19593 - use memcmp instead of dstrcmp

Using dstrcmp inside trace_addsym causes stack overflow, because dmd
 inserts trace_pro function to top of dstrcmp when -profile is added.

src/rt/trace.d

@@ -548,7 +548,10 @@ private Symbol* trace_addsym(Symbol** proot, const(char)[] id)
     auto rover = *parent;
     while (rover !is null)               // while we haven't run out of tree
     {
-        auto cmp = dstrcmp(id, rover.Sident);
+        immutable len = id.length <= rover.Sident.length ? id.length : rover.Sident.length;
+        int cmp = memcmp(id.ptr, rover.Sident.ptr, len);
+        if (!cmp)
+            cmp = id.length < rover.Sident.length ? -1 : (id.length > rover.Sident.length);
         if (cmp == 0)
         {
             return rover;

test/profile/mytrace.def.exp

@@ -1,4 +1,5 @@
 
 FUNCTIONS
+	_D4core8internal6string__T7dstrcmpZQjFNaNbNiNeMxAaMxQeZi
 	_Dmain
 	_D7profile3fooFkZk

test/profile/src/profile.d

@@ -13,4 +13,8 @@ void main(string[] args)
     trace_setdeffilename(args[2]);
     foreach (uint i; 0 .. 1_000)
         sum += foo(i);
+
+    // Issue 19593
+    assert(!("aaa" >= "bbb"));
+    assert("aaa" <= "bbb");
 }