Fix isAssociativeArrayLiteral for CI

Just calling parseAssignExpression instead of parseExpression in AA
checking now, since that's what's being done in the parsing code
anyway!

Doubled the debug stack limit. Should really investigate what's broken
here, since this stack usage is way too much.

Author: WebFreak001

src/dparse/parser.d

@@ -8400,7 +8400,7 @@ protected: final:
         immutable b = setBookmark();
         scope(exit) goToBookmark(b);
         advance();
-        immutable bool result = !currentIs(tok!"]") && parseExpression() !is null && currentIs(tok!":");
+        immutable bool result = !currentIs(tok!"]") && parseAssignExpression() !is null && currentIs(tok!":");
         cachedAAChecks[currentIndex] = result;
         return result;
     }

test/tester.d

@@ -310,9 +310,9 @@ int main(string[] args)
     // increase stack size in case of segfault:
     // stack usage in debug / non-optimized mode is _much_ higher
     version (D_Coverage)
-        enum maxStackSize = 256 * 4096;
+        enum maxStackSize = 512 * 4096;
     else debug
-        enum maxStackSize = 256 * 4096;
+        enum maxStackSize = 512 * 4096;
     else
         enum maxStackSize = 40 * 4096;