test: Ignore error in common_cells (broken on master), remove old IGN…

…OREs

The removed ignores referenced issues that have been closed and the tests
pass now.

test/svlog/common_cells.sv

@@ -1,4 +1,5 @@
 // RUN: moore %s -e foo -I ../third-party/common_cells/include ../third-party/common_cells/src/*.sv
+// IGNORE exp_backoff results in invalid signal widths
 
 module foo;
     typedef int unsigned addr_t;

test/svlog/funcs/call_free_args.sv

@@ -1,5 +1,4 @@
 // RUN: moore %s -e foo
-// IGNORE  part of #168
 
 function int bar(int a, int b);
     return a + b;

test/svlog/funcs/call_free_noargs.sv

@@ -1,5 +1,4 @@
 // RUN: moore %s -e foo
-// IGNORE  part of #168
 
 function int bar;
     return 42;

test/svlog/funcs/default_named.sv

@@ -1,6 +1,5 @@
 // RUN: moore %s -e foo
 // Default values for named arguments from IEEE 1800-2017 section 13.5.4
-// IGNORE  part of #213
 
 function bar(int j = 1, int s = 0);
 endfunction

test/svlog/funcs/default_pos.sv

@@ -1,6 +1,5 @@
 // RUN: moore %s -e foo -Vcall-args
 // Default values for positional arguments from IEEE 1800-2017 section 13.5.3
-// IGNORE  part of #213
 
 function bar(int j = 0, int k, int data = 1);
 endfunction