Remap source maps in JS DCE. Improve JS DCE error logging

See KT-19821

compiler/testData/cli/js-dce/parseError.args

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+$TESTDATA_DIR$/parseError.js
+-output-dir
+$TEMP_DIR$/min

compiler/testData/cli/js-dce/parseError.js

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+..

compiler/testData/cli/js-dce/parseError.out

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+error: at compiler/testData/cli/js-dce/parseError.js (1, 1): syntax error
+COMPILATION_ERROR

compiler/testData/cli/js-dce/parseError.test

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+// ABSENT: min/parseError.js

compiler/testData/cli/js-dce/withSourceMap.args

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+$TESTDATA_DIR$/withSourceMap.js
+-output-dir
+$TEMP_DIR$/min

compiler/testData/cli/js-dce/withSourceMap.js

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+if (typeof kotlin === 'undefined') {
+  throw new Error("Error loading module 'sample'. Its dependency 'kotlin' was not found. Please, check whether 'kotlin' is loaded prior to 'sample'.");
+}
+var sample = function (_, Kotlin) {
+  'use strict';
+  var println = Kotlin.kotlin.io.println_s8jyv4$;
+  function foo() {
+    println('foo');
+  }
+  function bar() {
+    println('bar');
+  }
+  function main(args) {
+    foo();
+  }
+  _.foo = foo;
+  _.bar = bar;
+  _.main_kand9s$ = main;
+  main([]);
+  Kotlin.defineModule('sample', _);
+  return _;
+}(typeof sample === 'undefined' ? {} : sample, kotlin);
+
+//# sourceMappingURL=sample.js.map

compiler/testData/cli/js-dce/withSourceMap.js.map

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+{"version":3,"file":"sample.js","sources":["sample.kt"],"sourcesContent":[null],"names":[],"mappings":";;;;;;;IACI,QAAQ,KAAR,C;EACJ,C;;IAGI,QAAQ,KAAR,C;EACJ,C;;IAGI,K;EACJ,C;;;;;;;;"}

compiler/testData/cli/js-dce/withSourceMap.out

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+OK

compiler/testData/cli/js-dce/withSourceMap.test

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+// EXISTS: min/withSourceMap.js
+// EXISTS: min/withSourceMap.js.map