5572 – [64-bit] Global Hidden Mutexes Seem to share Addresses W/ Global Variables

Apparently global gets overwritten when the synchronized block is entered in the following code:
import std.stdio;
void doSynchronized() {
 stderr.writeln("In doSynchronized() 1: ", cast(void*) global);
 synchronized {
 stderr.writeln("In doSynchronized() 2: ", cast(void*) global);
 }
}
__gshared Object global;
void main() {
 auto local = new Object;
 global = local;
 stderr.writeln("In main() 1: ",
 cast(void*) global, '\t', cast(void*) local);
 doSynchronized();
 stderr.writeln("In main() 2: ",
 cast(void*) global, '\t', cast(void*) local);
}
Output:
In main() 1: 7F4E605D8E70	7F4E605D8E70
In doSynchronized() 1: 7F4E605D8E70
In doSynchronized() 2: 0
In main() 2: 0	7F4E605D8E70
Happens only in 64-bit mode. -O, -inline and -release flags seem to be irrelevant.

https://github.com/D-Programming-Language/dmd/commit/8b008da60a01bb11721943f92dffe2cf38ea1a3d
https://github.com/D-Programming-Language/dmd/commit/2adc2e2e34a625324fe2e45d43e4d7ae84299291