Revert "[build-script] Do not specify LLDB_FRAMEWORK_INSTALL_PATH (#2…

[dan-zheng]

…8418)"

This reverts commit 486e2e7.

---

This fixes LLDB and the Swift REPL on macOS.

Before:

$ swift --version
Swift version 5.1.2-dev (Swift 3cbc14893e)
Target: x86_64-apple-darwin18.7.0
$ swift
dyld: Library not loaded: @rpath/LLDB.framework/Versions/A/LLDB
  Referenced from: /Library/Developer/Toolchains/swift-tensorflow-DEVELOPMENT-2019-12-09-a.xctoolchain/usr/bin/lldb
  Reason: image not found

After:

$ swift
Welcome to Swift version 5.1.2-dev (Swift f920eeee0a).
Type :help for assistance.
  1>

---

I debugged this issue by comparing the toolchain directory structure: System/Library/PrivateFrameworks is missing from the broken toolchain.

diff --git a/ok.txt b/bad.txt
index 62fb78a..6ec76d6 100644
--- a/ok.txt
+++ b/bad.txt
@@ -1,1028 +1,5 @@
 .
 ├── Info.plist
-├── System
-│   └── Library
-│       └── PrivateFrameworks
-│           └── LLDB.framework
-│               ├── Headers -> Versions/Current/Headers
-│               ├── LLDB -> Versions/Current/LLDB
-│               ├── Resources -> Versions/Current/Resources
-│               └── Versions
-│                   ├── A
-│                   │   ├── Headers
...

[burmako]

LGTM