Allocate _tlsRanges in C heap

Similar to the issue fixed here #1655 (comment) ,
static version of the sections_elf_shared accesses TLS of a dead thread. The simplest fix is to allocate
_tlsRanges somewhere that would persist outside of the thread scope, for example the C heap.

This was encountered while porting ldc 1.24.0 to Alpine Linux which uses Musl.
https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/14364 But this issue should
be affecting other libc implementations as well.

Author: omerfirmak

src/rt/sections_elf_shared.d

@@ -286,6 +286,7 @@ else
     void finiTLSRanges(Array!(void[])* rngs) nothrow @nogc
     {
         rngs.reset();
+        .free(rngs);
     }
 
     void scanTLSRanges(Array!(void[])* rngs, scope ScanDG dg) nothrow
@@ -369,7 +370,13 @@ else
      * Thread local array that contains TLS memory ranges for each
      * library initialized in this thread.
      */
-    @property ref Array!(void[]) _tlsRanges() @nogc nothrow { static Array!(void[]) x; return x; }
+    @property ref Array!(void[]) _tlsRanges() @nogc nothrow {
+        static Array!(void[])* x = null;
+        if (x is null)
+            x = cast(Array!(void[])*).calloc(1, Array!(void[]).sizeof);
+        safeAssert(x !is null, "Failed to allocate TLS ranges");
+        return *x;
+    }
     //Array!(void[]) _tlsRanges;
 
     enum _rtLoading = false;