Fix test harness

Author: andrewbranch

src/harness/compilerImpl.ts

@@ -256,7 +256,7 @@ namespace compiler {
         if (compilerOptions.skipDefaultLibCheck === undefined) compilerOptions.skipDefaultLibCheck = true;
         if (compilerOptions.noErrorTruncation === undefined) compilerOptions.noErrorTruncation = true;
 
-        const preProgram = ts.createProgram(rootFiles || [], { ...compilerOptions, traceResolution: false }, host);
+        const preProgram = ts.createProgram(rootFiles || [], { ...compilerOptions, configFile: compilerOptions.configFile, traceResolution: false }, host);
         const preErrors = ts.getPreEmitDiagnostics(preProgram);
 
         const program = ts.createProgram(rootFiles || [], compilerOptions, host);

tests/baselines/reference/pathMappingBasedModuleResolution1_amd.errors.txt

@@ -1,12 +1,7 @@
-error TS-1: Pre-emit (1) and post-emit (2) diagnostic counts do not match! This can indicate that a semantic _error_ was added by the emit resolver - such an error may not be reflected on the command line or in the editor, but may be captured in a baseline here!
 c:/root/tsconfig.json(5,17): error TS5089: Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?
 c:/root/tsconfig.json(6,17): error TS5089: Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?
 
 
-!!! error TS-1: Pre-emit (1) and post-emit (2) diagnostic counts do not match! This can indicate that a semantic _error_ was added by the emit resolver - such an error may not be reflected on the command line or in the editor, but may be captured in a baseline here!
-!!! related TS-1: The excess diagnostics are:
-!!! related TS5089 c:/root/tsconfig.json:5:17: Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?
-!!! related TS5089 c:/root/tsconfig.json:6:17: Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?
 ==== c:/root/tsconfig.json (2 errors) ====
     {
         "compilerOptions": {

tests/baselines/reference/pathMappingBasedModuleResolution1_node.errors.txt

@@ -1,12 +1,7 @@
-error TS-1: Pre-emit (1) and post-emit (2) diagnostic counts do not match! This can indicate that a semantic _error_ was added by the emit resolver - such an error may not be reflected on the command line or in the editor, but may be captured in a baseline here!
 c:/root/tsconfig.json(5,17): error TS5089: Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?
 c:/root/tsconfig.json(6,17): error TS5089: Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?
 
 
-!!! error TS-1: Pre-emit (1) and post-emit (2) diagnostic counts do not match! This can indicate that a semantic _error_ was added by the emit resolver - such an error may not be reflected on the command line or in the editor, but may be captured in a baseline here!
-!!! related TS-1: The excess diagnostics are:
-!!! related TS5089 c:/root/tsconfig.json:5:17: Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?
-!!! related TS5089 c:/root/tsconfig.json:6:17: Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?
 ==== c:/root/tsconfig.json (2 errors) ====
     {
         "compilerOptions": {