Apply Brendan's patch

update tutorial with kprobe struct args

fixes: https://github.com/iovisor/bpftrace/issues/8

Update README/INSTALL

filename typo

Tools

To get full arguments to pass into Clang for reading kernel headers

cmake: rename gtest external project target

This avoids a conflict in some environments (Arch Linux)

Fixes: #135
Signed-off-by: Brenden Blanco <bblanco@gmail.com>

update more tools to use args

Tracepoint adjust integer types

promote scalar printf args to 64-bits

freeze googletest version

We have googletest as a dependency for our tests. This dependency is
defined by cmake and fetched when we run make, but we were always
fetching master, which means if there is a breaking change upstream our
build will break without notice (which happened recently). To avoid
this, we freeze the googletest version to the last stable, and once
there's a new googletest release we can upgrade it here (making changes
to our code if necessary).

Fixes: https://github.com/iovisor/bpftrace/issues/122

Due to BPF stack alignment restrictions, LLVM might change the size used
to stored printf arguments in the stack, resulting in alignment issues
when formatting and outputting those arguments. To avoid this issue, we
promote every non-array argument to 64-bits, assuring the size used to
store the argument is the same used to dereference it later when calling
printf.

Fixes: https://github.com/iovisor/bpftrace/issues/47

add make install target

enforce infinite rlimit to avoid problems when allocating maps

update tutorial with tracepoint args

Destination can be set through the CMAKE_INSTALL_PREFIX variable when
running cmake (for example, `-DCMAKE_INSTALL_PREFIX=/usr/local`).

Files are installed as described below:
  - `build/src/bpftrace` -> `${CMAKE_INSTALL_PREFIX}/sbin`
  - `tools/*` -> `${CMAKE_INSTALL_PREFIX}/share/bpftrace/tools`
  - `man/*` -> `${CMAKE_INSTALL_PREFIX}/man`

Fixes: https://github.com/iovisor/bpftrace/issues/16

allow u32 binops and map keys

switch some tools to use args