[clang-format] Fixed typedef enum brace wrapping

Summary:
Bug: https://bugs.llvm.org/show_bug.cgi?id=34016 - **Typedef enum part**

**Problem:**

Clang format does not allow the flag **BraceWrapping.AfterEnum** control the case when our **enum** is preceded by **typedef** keyword (what is common in C language).

**Patch description:**

Added case to the **"AfterEnum"** flag when our enum does not start a line - is preceded by **typedef** keyword.

**After fix:**

**CONFIG:**
```
BreakBeforeBraces: Custom
BraceWrapping: {
AfterClass: true, AfterControlStatement: true, AfterEnum: true, AfterFunction: true, AfterNamespace: false, AfterStruct: true, AfterUnion: true, BeforeCatch: true, BeforeElse: true
}
```

**BEFORE:**
```
typedef enum
{
    a,
    b,
    c
} SomeEnum;
```

**AFTER:**

```
typedef enum
{
    a,
    b,
    c
} SomeEnum;
```

Contributed by @PriMee!

Reviewers: krasimir, djasper

Reviewed By: djasper

Subscribers: cfe-commits, klimek

Differential Revision: https://reviews.llvm.org/D37143

llvm-svn: 311998