additional error case coverage

test/error/include_apos.sv

+`include '/dev/null'

test/error/lhs_expr.sv

+module top;
+    logic x;
+    assign {<< {x, 2'b00}} = 3'b101;
+endmodule

test/error/lhs_pattern.sv

+module top;
+    logic x, y, z;
+    assign {<< {x, '{y:y, z:z}}} = 3'b101;
+endmodule

test/error/line_char1.sv

+`line 1 "asd" B

test/error/line_char2.sv

+`line 1 "asd" 1B

test/error/line_eof.sv

+`line
\ No newline at end of file

test/error/line_level.sv

+`line 0 "asd" 3

test/error/missing_include.sv

+`include "does_not_exist.sv"

test/error/undefined_macro.sv

+`SOMETHING
+module top;
+endmodule

test/error/unmatched_ifdef.sv

+`ifdef FOO