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createProgram calls host.getSourceFile multiple times
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**TypeScript Version:** 3.1.0-dev.20180807
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**Repro**
```ts
declare let oldProgram: ts.Program;
const originalHost = ts.createCompilerHost(true);
const host = {
... originalHost,
getSourceFile(fileName, ...args) {
console.log(fileName);
return originalHost.getSoruceFile(fileName, ...args);
}
const newProgram = ts.createProgram(oldProgram.getRootFileNames(), oldProgram.getCompilerOptions(), host, oldProgram);
```
**Expected behavior:**
Each fileName is logged once.
**Actual behavior:**
If `structureIsReused !== Completely` fileNames are logged twice: one time from `tryReuseStructureFromOldProgram` and another time from `findSourceFile`. That means these SourceFiles are requested multiple times. This is especially a problem with the default CompilerHost which has no caching. It therefore reads and parses each file multiple times, but only the last one is actually used.
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