clava.opt.NormalizeToSubset crashes when using global variables

[lm-sousa]

The following C code

int global_i = 0;
void print_matrix_result(double *A, const int N, const int K) {
	double acc = 0.0;
	while (global_i) {
		for (int j = 0; j < K; ++j) {
			//acc += A[i][j];
			acc += A[K*global_i + j];
		}
		global_i = 0;
	}
	printf("Result acc: %f\n", acc);
}

When combined with the JS script:

"use strict";

laraImport("clava.opt.NormalizeToSubset");
laraImport("clava.code.Inliner");

laraImport("weaver.WeaverJps");
laraImport("weaver.TraversalType");
laraImport("weaver.Query");

// Normalize all code
NormalizeToSubset(Query.root());

Crashes and throws the following error. Execution is halted without any code output:

!Problems while running Clava:

 During LARA Interpreter execution 
  
   when closing the weaver
    Cannot cast pt.up.fe.specs.clava.ast.stmt.ExprStmt to pt.up.fe.specs.clava.ast.decl.Decl
   Cannot cast pt.up.fe.specs.clava.ast.stmt.ExprStmt to pt.up.fe.specs.clava.ast.decl.Decl

The problem appears to be due to poor handling of the global variable global_i. If its declaration is moved to inside the function, making it a local variable, the error no longer manifests itself.